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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a8ba1921f4544d9ff0d8ad48a8692baa7c6a7d82b4fd1459419ac9f4c888b28' 
  AND token = '3MBr3XTwt0Wtk+PjicKygtKGn5M7gEDPFgogKU/KBGk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}